Maybe fit 2 12" fans as this has slightly more drawing area than a solitary 16" fan. Can you fit those AU twin thermo units that the MA70 boys are running?
What temperature is the thermo coming on? How many cores does your radiator have?
Would suggest a thermostat that opens at below 80 degrees and using a thermo switch that comes on at 85 and turns off at 80. I would scour the Tridon catalogue - it's fantastic.
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